Curable silicone composition and cured product of same, multilayer body and method for producing same, and optical device or optical display

Abstract

Provided is a curable silicone composition, a cured product thereof, a laminate body, a manufacturing method thereof, and an optical device or optical display exhibiting excellent performance for use as a member where transparency is required such as for an optical display, a touch panel, or the like. A curable silicone composition, comprises: (A) an organopolysiloxane having in a molecule at least 2 alkenyl groups with 2 to 12 carbon atoms; (B) an organohydrogenpolysiloxane having at least 2 silicon-bonded hydrogen atoms per molecule; and (C) a hydrosilylation reaction catalyst. Component (B) is present in an amount such that the silicon-bonded hydrogen atoms in component (B) are 0.5 to 2 mol per mol of aliphatic unsaturated carbon-carbon bonds in component (A), and 2 to 17.5 mol % of the silicon-bonded organic groups in the curable silicone composition are aryl groups.

Description

TECHNICAL FIELD[0001]The present invention is related to a curable silicone composition, cured product thereof, laminate body, manufacturing method thereof, and optical device or optical display.BACKGROUND ART[0002]Curable silicone compositions with high transparency and high elongation of a cured product are used as adhesives or pressure sensitive adhesives for improving the visibility of an optical display. An optical display must use a thermally unstable material such as liquid crystals, organic electroluminescence, and other display parts, touch panels, cover lenses, and other display forming members. Therefore, the used curable silicone composition is preferably cured at a relatively low temperature, specifically 40° C. or lower, and ultraviolet curable silicone compositions having been primarily applied thus far.[0003]However, there is a demand for a low temperature curable silicone composition which does not require ultraviolet radiation because decorative portions for decora...

AI Technical Summary

Benefits of technology

The present invention is a curable silicone composition that has excellent cold resistance, can be used in low temperatures, does not change color, and forms a highly transparent cured product. It is useful as an adhesive or pressure sensitive adhesive for optical displays and touch panels. The cured product and laminate body have excellent physical properties, are optically transparent, and have strong and durable adhesive strength and reliability under any conditions.

Problems solved by technology

However, there is a demand for a low temperature curable silicone composition which does not require ultraviolet radiation because decorative portions for decoration are often provided in the display periphery and ultraviolet light is not transmitted.

However, with conventional curable silicone compositions, the durability of an obtained cured product at low temperatures may be insufficient, and thus use may not be possible in aircraft or in cold regions.

Furthermore, when a specific substitution group is introduced to improve cold resistance, the cured product becomes discolored or turbid, and thus can not be used in optical displays or touch panels.

However, the document is intended for forming a sheet and does not describe or suggest a cured silicone composition for use in optical displays or the like.

However, when a phenyl group is simply introduced into the curable silicone composition, compatibility is insufficient between components, which causes a decrease in transparency and turbidity.

Thus, the cured product has a problem where discoloration or turbidity occurs.

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